But I would think to win sueing someone you have to show intent. If visa cut off ties when new evidence was presented I would think that would show a lack of intent?

In this case the plaintiff has to show knowledge, but showing is a later stage of the case. The decision here was only over whether a valid claim was stated.

Specifically cited in the decision (along with Pornhub purging of the vast majority of it's content in direct response to that suspension) as showing that Visa had the power to affect Pornhub content (since Visa had apparently argued that lack of such power as a reason they should not be liable even if they had knowledge.)